Combined telegraph and telephone.



mama 4|. Patented Aug. l5, I899. n. m. BAILEY.

COMBINED TELEGRAPH AND TELEPHONE.

(Application filed June 10, 1899.)

{No Model.)

fig. 1.

UNITE STATES PATENT OFFICE.

ROBERT M. BAILEY, OF \VILLIAMSPORT, PENNSYLVANIA, ASSIGNOR TO THE AMERICAN BELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.

COMBINED TELEGRAPH AND TELEPHONE.

SPECIFICATION formingpart of Letters Patent No. 630,841, dated August 15, 1899.

Application filed June 10, 1899. Serial No. 720,122. (No model.)

To all whom it may concern; In carrying out the invention I use a local 1 Be it known that I, ROBERT M. BAILEY, of circuit for telegraph apparatus and another \Villiamsport, in the State of Pennsylvania, local circuit for the microphone apparatus. have invented a new and useful lmprove- I also make use of an induction-coil between 55 5 meht in Telephony and Telegraphy,of which the microphone-circuit and the main line;

the following is a specification. but as in other systems of telephony involv- The object of the invention is to provide a ing the use of contact-transmitters such inmicrophone system of telephony with a deduction-coils are not necessary, and as is obvice for transmitting signals with all the exvious to those acquainted with common bat- 6o actness of a system of telegraphy employing tery systems of telephony, this-combination of the Morse or a similar code, taking advantelephone and telegraph apparatus may readtage of the fact that sounds are conveyed a ily be adapted to a common battery system. greater distance or more forcibly through In the drawings, Figure 1 is a representasolids than through air. As is well known, tion, for a large part diagrammatical, of com- 65 I it is diflicult to telephone numbers with cerplete apparatus embodying my invention by tainty, more or less confusion arising from which telephony or combined telegraphy and similarity of sounds in different numbers. telephony may be practiced between two sta- In some cases this fact almost prohibits the tions. Fig. 2 is a modification representing a use of telephony. For instance,railroad men telegraph-sounder attached to an ordinary 7o are reluctant to trust to mere articulation for long-distance telephone to be used according sending numbers that are to govern the acto myinvention atatransmitting-station with tion of persons at a distance, and yet for a telephone-receiver at the distant station. most of their messages, and perhaps for a The same letters represent corresponding large part of any single message containing parts in the two figures, but the numeral 2 7 a number or numbers, the speed attending subscript is written with everyletterin Fig. 2. the use of telephony is highly desirable. It Confining further description for the presis highly desirable, then, that persons telecut to Fig.1, atboth stations there represented phoning an order or instructions or informa- Bis a base-plate, of wood or any suitable tion, a part of which consists of numbers, material. 1 isamicrophone mounted there- 30 shall have at hand a convenient device for on, 6 being one of the electrodes, a carbon supplementing telephony with the more exact block resting directly on base-plate B, and 19 art of telegraphy; or, approaching the subbeing the other, a carbon pencil resting at one ject the other way, a person who has been end on block 6 and pivoted near the other accustomed to transmit messages containing end in supports that are fixed upon base- 3 5 numbers by the exact art of telegraphy will plate B. These two electrodes are connected find it a convenience to be able to readily by wires, as shown, to a battery E in a local supplement telegraphy by telephony, and circuit. K is a telegraph-key, and S a telethis may be done if only one or both of the graph-sounder, the latter being mounted dielectrodes of a microphone in a telephonerectly upon the base-plate B, and the said 4o circuit containing a telephone-receiver at a key and sounder being in a local circuit with distant station are mounted upon the same battery A, as shown. D represents an insupport or base as the sounder of a transmitduction-coil, and T a receiving-telephone in ting telegraph apparatus. the main line connecting the two stations.

The invention accordingly consists in the In the operation of the apparatus illustrated 9 5 4 5 combination at a translnittingstation, with a at Fig. 1 articulate speech will be transmitted line-wire containing a telephone-receiver at by causing the sound-Waves of the voice to a distant station, of microphone and telefall directly upon the plate B, which thus graph apparatus, the sounder of said teleserves as the sounding-board of an early form graph apparatus and one or both of the elecof microphone. lVhen signals or messages are I00 50 trodes of said microphone apparatus being senttelegraphically, the vibrations ofthetelemounted on the same base or plate. graph-sounder S are taken up by the electrodes c1) and cause similar variations in the local telephone circuit. \Vhen articulate speech is transmitted, the telegraph apparatus is at rest; but when the telegraph apparatus is operated the electrodes of the microphone, as well as the distant telephone-receiver, take part in the operation, and within the invention it is necessary that one or both of the electrodes be mounted upon the same base as the telegraph-sounder, for, as stated in substance above, it is an object of the invention to obtain for the microphone-electrodes the sharp and distinct signal-sounds of the telegraph-sounder that will be comm unicated to them through a rigid connection between telegraph-sounder and themselves as distinguished from communication through air. The vibrations of the telegraph-sounder are 'felt in the common support of the sound-er and the microphone electrode or electrodes and are directly communicated thereto. Within my invention, however, it is not necessary, when the electrodes of the microphone are employed for transmitting articulate speech, as distinguished from taking up and transmitting the signals of the telegraphsoun'der, that the sound-waves of the voice shall 'fall directly upon the common, base or plate upon which the telegraph-sounder and oneo'f the microphone-electrodes are mounted. For ordinary telephonic conversation by the apparatus, if more convenient, 'an ordinary telephone-diaphragm may be connected in the ordinary way with one of the electrodes of the microphone, usually known as the movable or hammer electrode, while the othertl1e anvil-electrode only, as it is often called is fixed upon the same base or plate as the sounder of the telegraph apparatus. Thus my invention can be readily applied to the long dist'ance microphone in ordinary use by rigidly attaching a bracket to the supporting At Fig. 2, L is the common long-distance transmitter, rigidlysupported upon a metallic arm R in the ordinary manner. (Z is the diaphragm, carrying one of the electrodes,

while the other electrode is rigidly supported by the case of the transmitter L and thearm These two electrodesare not shown, the construction being well known. B is a metallic bracket rigidly screwed'to the arm R and thus becoming a part or essentially one piece with the rigid support of the long-distance transmitter. S is a-telegraph-sounder rigidly mounted on the said bracket 13 K is a telegraph-key. A is the battery of "the local telegraph-circuit, and E is 't'h-e battery of the local telephone-circuit. T is the distant telephone.

Further description of the mode of "opera tion is unnecessary.

By my invention in cases where it is-d-e'sirable to employ both telegraph and telephone, as instanced above, the necessity of afswitch to bring one instrument into circuit with the line and throw the other out is avoided, and thus the same receiving apparatus is madeto serve for both forms of transmitting apparatus without switches.

I claim,

The combination with atelegraph-sounder, of the electrodes of a microphone in a tele phone-circuit, the saidtelegraphsounder and one or both of the electrodes of said microphone being mounted upon the same base or plate, substantially as described.

ROBERT M. BAILEY.

\Vitnesses:

ADDISON Cannon, CLARA J. H LL. 

